Telephone-exchange system.



C. L. GOODRUM- TELEPHONE EXCHANGE 81M. APPLlCATlbN. FILED MAY 22- I916.

' Patented Nov. 21, 1916."

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C. L. GOODRUM.

TELEPHONE EXCHANGE SYSTEM. mfucmmy FILED an 22. ms.

1,205,617? 1 mm Nov. 21,1916,

3 SHEETS-S HEET 8- To all whom it may concern: Be it know-nthat I, CHARLES L." GOODRUM, a citizen of the United States, residing at New York, iii the county of New York and- State of New York, have invented certain new and useful Improvements in Telephonethe connection with to wipe over the mu'ltiplesof'its Exchange Systems, of which the following is a full, clear, concise, and exact description.

This invention relates to telephone exchange systems ofthe type wherein the subscribers lines terminate as calling lines in passive contacts of automatic finder switches to which they are multipled, an idle one of such switches being set in motion to seek acalling subscribers line terminals by the mere removal of the telephone receiver from its hook by such party.

It is the object'of this invention to provide a system of this character wherein the average time interval between the removal of the receiver by the calling party, and his line terminals by a systems of this charm:

lines finder is reducedl' In for, the subscribers finder switches, dependent upon the traffic.

In accordance with this invention. the lines of all the groupsappear in multiples upon each finder, and each findershat has a number of sets of multiply-connected brushes, one for each group of lines, adapted groupin Means is search of a. calling dine therein.

' provided associated with the various finder with multiples of a calling line shafts. so constructed and arranged'thatif a call comes in simultaneously from each group, each of the finder shafts can, if idle,

connect with a different one of said calling lines by a secondary movement only; that IS HSSUCltllTBIl with the finder to say, means is brush shafts so constructed and'arranged that upon the simultaneous initiation of a call in each group, brushe -each serving a diii'erent group. will be simultaneously driven over theterminals of such groups in S(:ll'('ll of the calling lines. Means is also provided whereby, it thefinderallotted to a given group is busy, another finder can, by

a primary or group choosing movement followed by a secondary movement, connect in such group; that is to say,

suitable for use in -as shown in U. S. Patent Dixon, Feb. 9, 1915.

are divided int0 i groups, multipled to anumber of automatic the fingers PATENT OFFICE.-

TELEPHONE-EXCHAINGE SYSTEM. I

Specification of'Letters Patent.

v Application filed May 22, 1916. Serial No. 99,127.

Patented N 0v. 21, 1916.

being shown diagrammatically therein; and

Fig. 4 is a View showing the manner of slipping the trip fingers on the brush tripping rod to give each group a. finder which can.

line thereof without necesconnect with any choosing operation.

sitating a group Referring toFig. 1, the line terminals 1- across the face of a panel,

may be multipled No. 1,127,741 issued to Amos F. Vith each vertical row of say 500 terminals is associated a brush carrier 0, having fixed thereto five brush holders 4, carrying sets of-brushes 7), 6 etc., one for each section of the row, as shown in U. S. Patent 1,123,696 issued to EpB. Craft and J. N.

- Reynolds, Jan. 5,1915. As shown in detail in said patent, an insulated member GyfiXGd' to a lever Z, pivoted to an arm'a of holder.

maintains its set of brushes 6 1, normally out of operative relation to the correspond ing section {7 of the row of terminals 1. A trip rod 1" is also provided for each brush carrier 0' and carries spring-retracted collars (Z, one for each setv of brushes. Each collar has a finger f normally out. of the line of travel of thecorrespondinglever Z. A row of five terminally; If, one for each set of brushes b, isprovided at the topof the panel 2, over which a brush 8 fixed to rod 7' is provided with ratche'tl9, adapted to be engaged by the. pawl 10 ofa stepping magnet 11, and to be driven upwardly until one of f is in position to interlock with adapted to -wipe At its lower end, the trip" rod 7" is the lever Z, associated with the brushes 5* access to the desired group 9 The trip magnet 13 which have of terminals. energized, over 0b is then a circuit including brush .9,

the one allotted to the group 0 and the terminal of the row t belongin to the group of lines containing the calling line, and through its armature 50 and a member 14 on the rod 9'' twists such rod to cause the finger f,individual to the set of brushes 1) having access to multiples of the calling group, to interlock with the leverl of such set. The remaining fingers f pass out of the vertical plane in which the re-. maining levers Zlie, so that when the carrier 0 is raised, as will be presently described, such levers 1 will clear such fingers. When trip rod is rotated, a member 15 thereon shifts a lever 16. pivoted at 17,,to the right against the tension of spring 18. This results in pawl 19 being placed in operative relation to ratchet 20 of the brush carrier 0, and a pawl 10 being rendered inoperative with regard to ratchet 9. The stepping magnet 11 is now energized, and drives the brush carrier 0 upwardly, and the lever l of the desired set of brushes 6 is drawn downwardly by the finger f engaging therewith as the carrier 0 rises. This causes the insulated member 6 to be moved to the right, whereu on the brushes 1) are free to move inwardly, so as to wipe over the terminals 1 in the continued movement "of the carrier 0 under the control of stepping magnet 11. This is fully disclosed in the patent referred to, and therefore need not be described indetail herein. When the calling line is reached, the circuit of the stepping magnet 11 is opened. The trip rod r referred to is maintained elevated by a pawl 20, and the carrier 0 by a pawl 21. These pawls are adapted to be withdrawn upon the energization of re-' lease magnet 22. 7

Referring to Fi 3, each subscribers line A is provided wit the usual line and cutofi relays 25 and 24:, and terminates in multiples 51,52 of the findershown in Fig. 1.

A test terminal 53; is also provided in the finder for each line. The line and cut-oif relays-"27, 28 of afiother line in the group to which line, A belongs are also shown. A relay 29 is also provided, common to the group of lines, audits function is to start a finder in search of the calling line, upon the removal of the receiver at the substation thereof. Relays 30 and 31, whose functions will be described, are also common .to the group. The finder is controlled by the wellknown side switch, the escape magnet of, which is indicated by the numeral 32. The trip magnet 13, stepping magnet 11 and release magnet 22, are indicated diagrammatically in Fig. 3. g

Referring now to Figs. 1, 2 and 3, and 4 assuming the finder shown in Fi 1 to be lines to: which substation A belongs, it will be noted that the brush a at the top ofthe rod r (Fig. 1) is shown in Fig. 3 normall in'engagement with the first terminal! of the,

free pole of battery,

row t. This terminal t is multipled to the second terminal fin thefinder allotted to the next group, the third terminal t of the finder allotted to the third group, and so on. Assume now that a call comes in from substation A, and that the finder allotted thereto is idle. The removal of the receiver at substation A energizes the line relay 25, which, in attractin its armature, closes the following circuit: ree pole of battery, left winding of relay 25, outer armature and back contact of relay 24, conductor 35, armature aridspring 36 of relay 25, conductor 37, armature and back contact of relay 80, relay 29 to ground. Relay 29 energizes and locks itself directly to conductor 37 independently of the armature and hue wntact of relay '30, and at its ri t armature, closes a circuit to energize a. s ow relay 81: Relay 31, in attracting its right armature, extends the rightgrounded armature of relay 29 over conductor 88, side-switch arm 1 and its first-contact, conductor 54, and armatureand back. contactwof magnet 11 to free pole of battery. A prlgh in parallel thereto may be' traced m. the right. grounded armature of relay 29, conductor 39, terminal t, brush 0', arm 2 and its contact, esca magnet 32, trip. magnet 13, free pole of ttery. The eacaple magnet 82 is adapted to act more quickly t an the magnet 11, and before magnet 11 can.energiu, escape magnet 32 releases the side switch into osition 2. The trip magnet 13 also energizes in series with magnet 32, and, in position 2, these; magnets are maintained energized over a circuit including arm 2, conductor 65, arn'rl, conductor38 and the right armatures and front contacts of relays 31, 29. 'Magiiet 13 in operating, renders inoperative t spud 10 and renders operative the pawl 19, as described in connection with Fig- 1. In position 2, the following circuit is closed or stepping magnet 11:

magnet 11, its arma- 110 ture and back contact, arml and its second contact, conductor 38, right armature and front contact of slow relay 31, conductor 49, right armature and front contact of relay 29 to ground. This magnet, by making and 115 breaking its own circuit, elevates the carrier 0, during which movement the selected set of brushes 40, 41 and 42 are tripped, as described,and wipe over the multiples of the group containing those of the calling line. The remaining sets of brushes b on the carrierc, during this movement, do not ('ngage the multiples they are adapted to serve, since the members 6 of such sets maintain the brushes pressed ontws'rdlyl As the brush 42 passes over the multiples 53, cutoff relays 24 are operated in succession. .When the cut-ofi relay 24 of the calling line i is reached and attracts its armatures, the

corresponding line relay 25 falls back, open- 13..

29, in retracting its right armat 'e, opene the circuit of magnet 11,. thus stopping the brushes 40, 41 and 42 upon the calling line multiples 51, 52 and 53. The retraction of this armature also deenergizes magnets 32 and 13, the deenergization or the former re,- leasing the side switch into position, 3. t

In position 3, arm 3 maintains ground upon brush 42, thus maintaining the cut-off relay 24 energized. Side-switch arms 0 and 71 now extend the calling line through to conductors 43, 44, which may terminate in locking with the lever as before,

4 such finder, armature and the group to .pears as the secondterminal F from the botside-switch arm 1 and a first selector, or at an operators position, epending upon the character ofthe system. Side-switch arm 72, in moving into position 3, prepares a circuit for the release magnet 22 of the finder. In the finder F allotted to the-next group of lines, the terminal of which substation A belon'gsaptom. In the next group, this terminal appears as the third terminal t? from the bottom and so on. The arrangement is such that in the finder allotted to a given group, a call from one of the lines thereof will result in the finger f of such finder interl of a set of brushes having access to multiples ot-s'uch group, the remaining fingers) passing out of the line of travel of the other levers Z. If the finder allottedto the group to which substation A belongs is busy, the next idle j finder is associatedwith suchgroup overs;

starter wire 48. As side-switch arm :1 moves into position 3, the remaining lines of the group. to which substation Abelongs, and those of the other groups beyond, from which iii-starter wire 47 leads, are associated with the next idle finder by starter wire 48. Assuming that another line in the group to which substation A belongs initiates a call, while the finder of Fig. 3, which is the one allotted to such group, is busy, the relay129, is energized and applies ground to the multiples t, t, t of the group of multiples t in the finders in which this group of lines appears, and energizes relay 31, which closes the following circuit; ground, rightarma hire and front contact of relay 2!), conductors 39, 49, right armature and front contact of relay 31, conduc'tor 38, arm 1 and its third contact, conductor 48, arm 1 and its first contact of finder F conductor 54 of back contact of magnet'll, free pole of battery. Magnet 11 interrupts its own circuit, thus elevating the trip rod 7' of the finder F -lVl1en brush 8 engages grounded multiple t ,a circuit is closed for the escape magnet 32 of finder F and trip magnet 13 of such finder in series. At that instant, the finger f on the trip rod 7* of such 'finder is in position to interlock with lever l of the brush set I) havingaccess downwardly, as it line. When manner.

ption, if such finder were idle.

giziitionf f magnet. 13. causes such finger and lever to interlock, and since In position 2 the circuit of this magnet and magnet 11 is maintained, as hereinbefore described, the carrier 0 is elevated and the lever Z is drawn passes finger f, whereupon the set of brushes wipes over multiples of the group containing those of the calling cut-oil relay 24 of'the calling line is reached and Operated, deenergiz'ing relay 25, the relay 29 deenergizes, opening the circuits of magnets 11, 32 and, 13, stopping the finder brushes upon the calling line terminals. Upon the disestablishment of the connection, ground may be'placed upon conductor 45 in any well-known manner, thus energizing contact 46, which releases the finder. The release magnet in operating restores the side switch in the well-known While in the diagrammatic showing (Fig. 3). the'second finder F is located immediately to the right of the first finder F, in actual practice, it is preferred to arrangethem as shown in Fig. 4, wherein-the ninth fin'der'from F' with regard to the advanced starter wire; that is to say,

i finder F were bus;' and a call is initiated in the group to whlch it is call would start finder F (Fi'g. 4) in mo- An inspection of Fig. 4 shows that the finder F, allotted the finder release magnet 22 in point of location: would be the next finder to F allotted, such 7 to the group containing substation A, which 'we will assumeto be the first group, has a finger f, the lowermost one on'the rod r normally in' position to interlock with the lever 'Z of the set of brushes. b having access to multiples of this group; that the finder F allotted to the second group, has

. a finger f normally in position to interlock with a lever Z of a set of brushes 71 having access to the line group to which it is allotted, and a finger 58 adapted vuponone stop being given the triprod r to; be in position to interloclnwvhen such rod 15 rotated with the lever of a set of brushes hav ng access to multiples of the group to which substation A belongs.

tVhat is claimed is? It. In an automatic telephone exchange system wherein calling lines are divided into groups, the groups terminating in dif ferentsections of a row of terminals multipled so as to be accessible to a number of" brush carrlers the combination with a carrier for each row, driving means for said carriers, and mult ply mounted on said carriers. one for each secconnerted brushes tion of terminals, of means'assmviamd with said carriers and so constructed'and arranged that upon thesimultaneous initiation' of calls in Several of said groups,

' ferent sections 0 they are adapted to serve,

ghaieach serving a different section, will hills; be simultaneously driven over suchsections of the callby said driving meansin search mg lines.

:5. In an automatic telephone exchange brushes, each serving a. different section,? for will be rendered operative, and means thereupon driving said carriers to cause said brushes to wipe over the corresponding sections in search of the calling lines.

3. In an automatic telephone exchange system wherein calling lines are divided into groups, said groups terminating in different sections of a row of terminals multipled so as to be accessible to anumber 0 usb carriers, the combination with a car- :r for each row, and multiply connected crushes mohnted thereon, one for; each'secs it a of terminals, said brushes beingfnorally in inoperative relation to the sections hey are adapted to serve, of a trip rod associated with each carrier, each rod having a tripping device for each brush thereon,- meansfor actuating said rodto render it one of said brushes operative upon'the initiation of a call, the relation of the tripping devices to the brushes on the various carriers being such that when calls come in from several of the groups simultaneously said t 'i -rods render operative brushes serving a difierent section in each row,.and means for driving said carriers to cause said brushes to wipe over tions in searchiof the calling lines.

4. In an automatic telephone exchange system wherein calling lines are divided into groups, said roups a vertical row; of'terminals multipled across as to be accessible to a number of brush carriers, the combination with, a carrier for each ve'rticalrow, driving means for said carriers, and multiply connected mounted on said carriers, one tion of the row, of means associated" with said carriers and upon the simultaneous initiation of callsin several of said groups, to cause said'carriers to be driven by said driving means over said rows with a brush serving a difierent section in each row wiping over the terminals of said section in searclrof the calling linenbe accessible to a number of multiply connected 1 simultaneous fingers on the various I closed upon the the corresponding sec.

.lation to the trip I brushes having access" terminating' n dip,

the face ,of'a panel: so

inoperative said erative said pawl in-ashes for each, secconstructed and arranged,

a In an automatic telephone exchange i system wherein calling hnesare divided into groups, each of said a different section of a row of terminals nudtipled so as to be accessible to "a number of brushcarriers, carrier for each row, lotted to a different line group, connected brushes mounted thereon, one each section of terminals, a trip, lever and resting at the ba'selof the sectionit' is adapted to serve and being normally pressed out of theqline of the terminals, of a trip rod associated with each carrier,'each rod having a tripping fingerfor each brush thereon, means ously rotating said rods upon of a calllin each group, the relation of the trip i rods" being X such with a brush serving each carrier being alfor that a finger-'associated each brush having groups terminating in f the combination with a p and multiply I for simultane- 4 the initiation 1 a different section in each row isinterlocked with the leverof such brush, and meansfor driving said carriers, during which movement said fingers cause the corresponding 1 levers to trip the associated brushes,

(3. In an automatic system wherein calling lines groups, each of said groups terminating in a difierent section of a row of terminals multipledso as tobe accessible to a. number of brush carriers, the combination with a carrier telephone exchange ar divided into I for each .row,and multiply connected brushes mounted thereon, one for each section of terminals,each brush havinga trip lever and resting at the base of thesection'it is adapted to serve and being normally pressed out of the line of the terminals, ofatrip rod ass sociated with each carrier, eac a tripping finger foreach brush thereon, a steppin ma et havin pawls 10 and 19, the paw 10 ing norma 1y operative to elevate the trip rod, and the pawl19 being normally inoperative withnrelation to the carrifer, a circuit 4 for said steppin magnet initiation of a cal adapted to operate said magnet to elevate said'trip rod to place a finger thereon in operative relever of the one of said to multiples of the calling group a magn t for rotating said frod,a circuit therefor closed when said rod is positioned to cause saidfinger to interloc 19, and a circuit for said stepping magnet tojelevate said carrier, durin ment' said finger causes sai the multiples of the calling group insearch of the'calling line.

h rod having.-

my" a with the associated lever and to render k 110 and to render op- 1205 adapted to cause the same which movelever to trip, said brush to cause the same towipe over 1251;

7. In an automatic telephone exchange system wherein calling lines are groups multipled'to groups of her of finders,

a num the combination with divided mto terminals m t lie finder s, ebrush carrier f0 :dnving means? 11 plurality of one for' each '3 ated 'with sai and arranged initiation of ea 1 each finder, .said carrier havingmultiply connected brushes, oup, of trip means associcarriers and that upon the simultaneous 11s in several ofsaid groups,

therefor,

so constructed.

brushes, each serving a different group, will be. simultaneously driven over such terminal groups by said driving means in Search 10 of the calling lines. Y "In witness whereof, I hereunto subscribe my name this 20th day of Mey AJD, 1916.

CHARLES L. GOODRUM. 

